About this 3D model

This is a master spool designed for use with Filaments.ca econofil refill spools. The shaft in the center has a diameter of 76mm which should line up perfectly with the hardpaper core of the refill spools. This design requires at least 2 M6 screws and nuts. It is possible that the nuts be tight in their slot... The 4 concentric lines indicates about 1/4 volume of the spool.